JP5410817B2 - Film winding method - Google Patents

Description

  The present invention relates to a method of winding a film using a center drive film winder having a near roll and a touch roll, and a wound product of a film wound using the winding method. Examples of the film include a laminated film such as a cover tape film for carrier tape used when an electronic component is conveyed.

  From the convenience of storage and conveyance, the film is usually traded in a state of being wound around a winding core, that is, as a winding roll. For example, a cover tape used for enclosing a chip-type electronic component such as an IC circulates in a state of being wound in a narrow state by forming a wide width or a slit in a winding core.

  As a film winding method, a film winding method using a center drive film winder and a film winding method using a surface drive winder are generally known. The latter winding method is a method in which the roll that presses the winding center axis is not driven actively but the roll that presses the winding center axis is actively driven to wind the film in a roll shape. The film can be wound at a high speed from a small diameter to a large diameter without changing the driving torque even if the winding diameter of the film increases. However, this winding method is limited in application when winding a film having uneven thickness or a slippery film because wrinkles are likely to occur in a thin part of the film or uneven winding hardness occurs. There are many. On the other hand, the film winding method using the former center drive type film winder is a method of winding the film in a roll shape by driving the winding center axis, and is highly versatile and can wind many films. Has been applied.

  A film winding method using a center drive type film winding machine has been adopted in various fields, and attempts have been made to improve the winding method. When the film is directly wound using this winder, air is sandwiched at the winding start point due to the influence of air accompanying the film. If it is something that allows air to pass through, such as a non-woven fabric, air will escape immediately, so there is no problem, but if it is difficult to pass air like a film, it will not be able to completely expel air, Will be involved. As the diameter of the take-up roll increases, the radial clamping pressure increases and the entrained air is expelled from the side of the take-up roll. The irregular movement of the air between the film layers at this time causes winding slippage and wrinkles. In addition, since there is an internal stress in the winding roll, the air remaining between the film layers gradually escapes during storage and transportation after winding, and winding deviation and wrinkles due to winding tightening occur. For this reason, various methods have been proposed in which a touch roll is provided in front of the take-up center axis and the film is taken up while preventing air entrainment by touch winding. For example, when winding a magnetic tape or the like, a method of moving the support portion of the touch roll so as to follow the winding diameter (Patent Document 1), or when winding a nonwoven fabric or the like, There is a method of controlling using a press roll as a pressing load at the end of winding (Patent Document 2).

  However, the winding method called “touch winding” using the touch roll described above is effective in preventing air entrainment in the case of a film with little uneven thickness, but it is more than a specific range in the width direction of the film. When winding a film having meat, as the winding diameter of the winding roll becomes larger, the unevenness (cove) of the winding roll becomes prominent. Therefore, at the beginning of winding, the touch roll is pressed in parallel with the winding center axis. However, as the winding diameter of the winding roll increases, the winding of the film on which the touch roll has already been wound due to the influence of unevenness. There was a problem that the parallelism between the two was not evenly applied to the take-up roll. As a result, the parallelism between the touch roll and the guide roll on the upstream side of the film is deviated, which causes the film to be wrinkled.

  Also, in the case of film winding, the winding roll wound is generally hard because the amount of air between the film layers is small, the adhesion between the film layers is increased, and the friction coefficient is increased. Tend to be. When a film with uneven thickness is wound up tightly by this method, the uneven part of the winding roll is plastically deformed, and the film itself may be distorted (flared) when it is unwound and may not be used. In addition, when a laminated film having a sealing layer such as a cover tape is wound up hard, there has been a problem that the films adhere to each other and the film cannot be fed out or is difficult to feed out.

  In order to solve this problem, a method of winding the film by reducing the touch pressure of the touch roll as much as possible has been tried, but the winding of the touch roll is arranged at the position where the film of the winding roll first contacts the winding roll. In the case of the method, if the touch pressure of the touch roll is small, the touch roll easily escapes and the stable touch pressure cannot be maintained, and there is a problem that the wound film is wound and wrinkles occur. .

  Furthermore, in the above-described touch winding, when the film is automatically rewinded, when the contact of the touch roll is once opened and the winding center axis is transferred to another winding center axis, the film winding deviation or wrinkle occurs. Has occurred.

JP-A-2005-206301 JP 2006-225135 A

  The present invention has been made in view of the above circumstances, and is a film that can suppress winding slippage during film winding and film rewinding, wrinkle suppression, and deformation of the winding roll during film storage and transportation. The present invention provides a winding method and a wound product wound by using the winding method.

  As a result of earnestly examining the method for solving the above problems, the inventors of the present invention have continuously applied the touch pressure and the film winding in the center drive film winder having the near roll and the touch roll from the winding start to the winding end. It has been found that by controlling the take-up tension, it is possible to suppress winding deviation and wrinkles at the time of film winding and film rewinding, and to suppress deformation of the winding roll during film storage and transportation.

  That is, the present invention has a winding core 5 and a winding center shaft 3 for winding a film 4, and has a center roll film winding having at least an upstream near roll 1 and a touch roll 2 disposed downstream thereof. Using a take-up machine, the touch pressure of the touch roll 2 and the winding tension of the film are controlled so as to gradually decrease from the beginning of winding of the film or the middle of winding to the end of winding. This is a film winding method. Then, the distance between the near roll 1 and the take-up roll 6 is controlled within 0.5 to 10 mm from the beginning to the end of winding of the film, and the touch pressure of the touch roll 2 is in the range of 30% to 80% with respect to the initial pressure. In addition, it is preferable that the winding tension of the film is successively and gradually decreased within a range of 30 to 80% of the initial tension.

The present invention is suitable for winding a film having a film width of 5 mm to 1500 mm and a film thickness of 0.01 mm to 2 mm. For example, it can be suitably used for winding a film for a carrier tape cover tape.
Moreover, this invention includes the film wound by the said winding method.

  According to the present invention, it is possible not only to finish the wound state of the film wound up in a roll shape, but also to maintain the good state during storage and transportation after winding. A winding method and a winding roll of a film wound into a roll can be provided.

It is the figure which showed typically the winding method which concerns on this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to FIG.

  FIG. 1 is a conceptual diagram illustrating a film winding method according to this embodiment. As shown in FIG. 1, the film winding method according to the present embodiment includes a center drive type film winding machine including a near roll 1, a touch roll 2, and a winding center shaft 3, and a winding core 5 for winding the film 4. To do. The core 5 obtained by the winding method and the film 4 wound in a roll shape are collectively referred to as a roll-shaped winding roll 6.

At the time of winding the film, the gap is adjusted so that the near roll 1 moves in parallel with the apparatus so as not to contact the take-up roll 6. As a result, as the winding progresses as described above and the winding diameter of the winding roll 6 increases, the parallelism between the near roll 1 and the winding roll 6 may be lost due to the influence of the unevenness of the film. It can suppress that a wrinkle generate | occur | produces in the film wound around the winding roll 6 in this position because distance becomes short.
The distance between the near roll 1 and the take-up roll 6 is preferably controlled within 0.5 to 10 mm. If it is less than 0.5 mm, the influence of the winding bump becomes relatively large, and there is a possibility that the winding roll 6 and the near roll 1 may come into contact with each other at a large diameter portion. If it exceeds 10 mm, wrinkles may occur between the near roll 1 and the take-up roll.

  In the present invention, the touch roll 2 is provided after the near roll 1. Since the near roll 1 is not in direct contact with the take-up roll and is not affected by the unevenness of the take-up roll 6, the deviation in parallelism between the near roll 1 and the guide roll on the upstream side of the film does not become a problem, and wrinkles occur between these Things will disappear. The film is in a state where air is entrained between the near roll and before the touch roll. However, since the film is grounded to the take-up roll 6, even if the take-up roll 6 has irregularities, this film is wound. It will not be affected.

The positional relationship between the near roll and the touch roll is effective at any position other than the tangent line between the film and the roll and is not limited.

Further, the winding roll 6 having a diameter change in the width direction with respect to the winding diameter, such as a winding cove, may cause deformation at the hump portion unless the internal stress is reduced, and at the same time, the winding roll is wound up. In order to prevent wrinkles due to tightening during product storage and transportation later, it is necessary to reduce the touch pressure. In winding the film, it is preferable that the touch pressure of the touch roll 2 is gradually and gradually reduced by 30 to 80% with respect to the initial pressure. Since the touch roll 2 is only touching the winding roll 6 with a tangent line, air entrainment can be stably suppressed even if the touch pressure is small. Further, even when the winding roll 6 is uneven and hits a piece, the touch pressure can be maintained in a stable state.
As a result, the winding hardness during winding of the winding roll 6 and after winding becomes softer than touch winding without using a normal near roll, and the plasticity of the concavo-convex portion during winding of the winding roll 6 and after winding. Even when a film is unwound due to deformation, and even a laminated film having a sealing layer such as a cover tape, there is an effect of remarkably suppressing the occurrence of problems such as the films adhering to each other and being unable to be unwound or difficult to be unwound.

Furthermore, by providing the touch roll 2 in the same frame as the winding center axis, the winding center axis can be transferred to another winding center axis without opening the contact of the touch roll 2, and winding from the beginning of film winding is possible. The film can be wound while continuously touching to the end.

The material of the near roll 1 and the touch roll 2 is not particularly limited, but a lightweight metal or rubber roll that hardly affects the winding tension of the film is preferable.

The pressure control method for the touch roll 2 is not particularly limited, and examples include a method in which air cylinders are provided on the left and right sides of the touch roll 2 and the air pressure of the cylinder can be automatically adjusted.

In winding the film of the present invention, the outer diameter of the core 5 is not particularly limited, but is preferably 86 mm or more and 117 mm or less, and more preferably in the range of 92 to 107 mm. If it is 86 mm or more, curling wrinkles when the film 4 is unwound is suppressed, and handling during use is easy. Moreover, it is preferable that it is 117 mm or less from the ease of handling at the time of storage and transport.

The winding tension is a force that pulls the film 4 in the length direction at the winding position when the film 4 is wound around the core 5. It is preferable that the winding tension is gradually reduced continuously in the range of 30 to 80% with respect to the initial tension at the time of winding the film. By such control, a great effect can be obtained by suppressing generation of wrinkles and winding deviation of the film.
The method for controlling the winding tension is not particularly limited, but the film winding tension is detected according to the winding length of the film 4 wound around the winding core 5 and the winding diameter of the roll-shaped wound material 6, Those that can be adjusted automatically are preferred.

  When winding a film, it is necessary to wind the film around the core at the start of winding, and in the wound state from the beginning of winding to several laps, it is easily affected by the material and thickness of the core. Omission is likely to occur. If this effect is likely to occur, the touch pressure and film tension are maintained at the same level as the winding start value for a certain period from the beginning of winding, and then gradually decrease from the middle stage of winding to the end of winding. The effects of the present invention can be obtained. Even in such a case, the period during which the film tension and the touch pressure are maintained at the same level as the beginning of winding is such that the increase in the outer diameter of the winding roll is up to 30 mm, preferably up to 20 mm. If the film tension and the touch pressure are maintained at the same level as the beginning of winding beyond that, it becomes difficult to sufficiently suppress wrinkling and winding deviation of the film.

  The film that can be used in the present invention may be either a single-layer film or a laminated film using an industrially used resin, and a film obtained by processing an antistatic agent or the like on the surface of these films. May be.

  The resin constituting the film is not particularly limited, but polyesters such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), a mixture of polyethylene terephthalate and polyethylene naphthalate, polyolefins such as polypropylene and polyethylene, poly Examples thereof include vinyl chloride resins and styrene resins. Moreover, although a mixture etc. can be used, it is not limited to these.

  The thickness of the film is not particularly limited, but a film having a thickness of 0.01 mm or more is preferable because it rarely causes film breakage. On the other hand, in the case of a thick film, 2 mm or less is preferable from the viewpoint of easy handling, more preferably 0.1 mm or less, and still more preferably 0.08 mm or less.

  The width of the film is not particularly limited, but is generally 5 mm or more and 1500 mm or less. Those having a width of 1 mm or more are preferable in that a great effect of suppressing collapse during storage or transportation can be obtained. On the other hand, the width of the film 4 is preferably 1500 mm or less from the viewpoint of easy handling during use and main applications.

  The length of the film is not particularly limited, but considering the ease of handling, the main application, and the actual situation of transactions, typically the film length is 100 m or more and 6000 m or less. Generally, in order to keep the winding state stable, the shorter the winding length, the more advantageous.

  The core 5 can be suitably made of a paper material or a plastic material. It is preferable to use a plastic material from the viewpoint of durability against the stress applied to the core 5 when the film 4 is wound. Further, a resin to which glass fiber is added for the purpose of improving the strength of the core 5 can also be used as a constituent material of the core.

  The winding width of the core 5 depends on the width of the film 4 to be wound, and is preferably the same as or slightly wider than the width of the film 4, for example.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further, this invention is not limited to these.

Example 1
A laminate film having a width of 880 mm was prepared by using a polyethylene terephthalate film having a thickness of 12 μm as a base material, and laminating a polyethylene resin layer having a thickness of 20 μm and a styrene resin layer having a thickness of 30 μm. The winding diameter deviation caused by the width direction thickness deviation after lamination was 1 mm in radius.

The center drive type film winder described in FIG. 1 is used to wind the film under the following operating conditions, to create a 3000 m roll, and to perform the rewinding operation. The situation at the time was evaluated. The winding central axis (core) used was a spiral-wound plain paper tube having a thickness of 15 mm and an inner diameter of 3 inches (outer diameter: 106 mm).
The winding condition is a constant tension from the beginning of winding to the winding diameter of 120 mm, from the winding diameter of 120 mm to the end of winding, and the touch roll pressure and winding tension are the conditions described in Table 1, from the winding diameter of 120 mm to the end of winding. Control was performed to gradually and continuously decrease.

The following evaluations were made on the situation during and after the winding.
(1) Roll wrinkle occurrence during winding
(2) Occurrence of winding misalignment during winding
(3) Occurrence of bumps during winding
(4) Evaluation equivalent to winding slippage during transportation
(5) Situation evaluation during rewinding
(6) Evaluation of tightening after storage Each of them was evaluated as “Excellent” with no occurrence at all, “Good” at occurrence of a problem-free level, and “Poor” when it occurred and became defective.

(Example 2)
The same procedure as in Example 1 was performed except that the tension was gradually decreased from the beginning of winding.
(Example 3)
It was the same as Example 1 except that the winding end of the touch roll touch pressure was 0.030 MPa (change rate 40%).
Example 4
It was the same as Example 1 except that the distance of the near roll was 10 mm from the start of winding to the end of winding.
(Example 5)
Example 1 was the same as Example 1 except that the winding end of the winding tension was 91 N (change rate 30%).
(Example 6)
Example 1 was the same as Example 1 except that the winding end of the winding tension was 26 N (change rate 80%).

(Comparative Example 1)
It was the same as Example 1 except that the distance of the near roll was 0 mm from the start of winding to the end of winding.
(Comparative Example 2)
Rewinding and rewinding were carried out without using a touch roll. The near roll distance and winding tension were the same as in Example 1.
(Comparative Example 3)
Example 1 was the same as Example 1 except that the winding end of the winding tension was 130 N (change rate 0%).
(Comparative Example 4)
Example 1 was the same as Example 1 except that the winding end of the touch roll touch pressure was 0.05 MPa (change rate 0%).

The evaluation results of Examples 1 to 5 and Comparative Examples 1 to 4 are summarized in Table 2 and Table 3, respectively.

  As is apparent from Table 2, in a center drive type film winder having a near roll and a touch roll, the touch pressure and the film winding tension were controlled continuously from the beginning to the end of the film. No winding slippage, wrinkles, or deformation of the winding roll during film storage / transport during winding and film rewinding are observed. In the above, this invention was demonstrated based on the Example. It is to be understood by those skilled in the art that this embodiment is merely an example, and that various modifications are possible and that such modifications are within the scope of the present invention.

  The film winding method according to the present invention can be easily applied to processing equipment having general specifications, and is particularly suitable for a cover tape for a carrier tape or the like that is required to control the winding state with high accuracy. It can be used suitably.

1 Near roll 2 Touch roll 3 Winding central axis (core)
4 Film 5 Core 6 Winding roll

Claims (7)

It has a winding core (5) for winding the film (4) and a winding center shaft (3), and has at least an upstream near roll (1) and a touch roll (2) arranged downstream thereof. When viewed in plan from the winding central axis (3) direction, the film forms a common tangent to the two rolls between the near roll (1) and the take-up roll (6), and the near roll ( 1) and touch roll (2) using a center drive film winder, characterized in that the film does not make a common tangent to the two rolls, from the beginning to the end of the film Until the distance between the near roll (1) and the take-up roll (6) is controlled within 0.5 to 10 mm, and the touch pressure of the touch roll (2) from the beginning or middle of winding of the film to the end of winding. In the range of 30% to 80% of the initial pressure, and in the range of 30% to 80% of the winding tension of the initial tension of the film, winding method of a film, characterized in that to each successively lower gradually .   The film winding method according to claim 1, wherein the width of the film is 5 mm or more and 1500 mm or less.   The film winding method according to claim 1 or 2, wherein the thickness of the film is 0.01 mm or more and 2 mm or less.   The film winding method according to claim 1, wherein the film is a laminated film.   The film winding method according to any one of claims 1 to 4, wherein the film is a laminated film having a seal layer.   The film winding method according to claim 1, wherein the film is a film for a carrier tape cover tape.   A film winding roll wound up by the film winding method according to claim 1.

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